TI AFE4300低成本衡器和人体成份测量模拟前端解决方案

TI公司的AFE4300是低成本的衡器和人体成份(BCM)测量模拟前端(AFE),集成了两个单独的信号链:一个用来重量测量,一个采用16位860SPS ADC进行人体成份分析.器件中的三个BCM通路允许对身体手和足间的部分身体阻抗进行分析(BIA),从而得出人体成份的全图.器件的工作电压2 V- 3.6 V,主要用于衡器和人体成份测量.本文介绍了AFE4300主要特性,方框图,衡器前端框图和BCM前端框图以及评估板AFE4300EVM-PDK框图,电路图,材料清单和PCB元件布局图,并介绍了典型的人体成份分析图.
TI introduces the industry’s first fully integrated analog front end for both weight and body composition measurement (BCM). The AFE4300 is an easy-to-use, precision, low-power front end solution, which allows engineers designing weigh scales that incorporate body composition meters, body impedance analyzers, and impedance measurement equipment to get their products to market faster than by implementing existing, more complex multi-chip solutions.
The AFE4300 incorporates two separate signal chains, one targeting weight measurement and the other targeting body composition analysis, with a 16-bit, 860-sps analog-to-digital converter (ADC) multiplexed between them. The device’s three BCM channels enable segmental body impedance analysis (BIA) between body extremities, which allows for a full picture of the subject’s body composition.
The AFE4300 is a low-cost analog front-end incorporating two separate signal chains: one chain for weight-scale (WS) measurement and the other for  body composition measurement (BCM) analysis. A 16-bit, 860-SPS analog-to-digital converter (ADC) is  multiplexed between both chains. The weight  measurement chain includes an instrumentation amplifier (INA) with the gain set by an external  resistor, followed by a 6-bit digital-to-analog converter (DAC) for offset correction, and a circuit to drive the  external bridge/load cell with a fixed 1.7 V for ratiometric measurements.
The AFE4300 can also measure body composition by applying a sinusoidal current into the body. The sinuso...